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flexoTHERM air source heat pump

flexoTHERM and aroCOLLECT for air source applications

  • Available in five models covering 5, 8, 11, 15 and 19kW heating out
  • ErP A+++ rated for both hot water and heating efficiency
  • Dimensions in mm (5kW): W 595 x H 1185 x D 600
  • Quiet Mark awarded as one of the quietest heat pumps available


flexoTHERM 400V with aroCOLLECT air source brine collector module act as an alternative to a ground loop heat pump and can be specified in a wide variety of social housing or new build developments.

aroCOLLECT is a three-phase air collector that uses the ambient air temperature to warm the brine fluid just like a ground loop system. The result is a high-efficiency air-to-water heat exchanger that ensures there is no heat loss between the outside and indoors. It features fully modulating ventilators with minimal sound production, which means the system runs very quietly, operating with a very low noise level of 39.8dB(A) (400V, 5kW).

aroCOLLECT features a twin unit connection using balanced Tichelmann piping, reverse return system and is ideal for outdoor use in agricultural, commercial and residential projects.

flexoTHERM and aroCOLLECT are MCS accredited, so may qualify for the RHI scheme.

Features and benefits:

  • Available in 400V - 400V heat pump is available in 5, 8, 11, 15 and 19kW models
  • More power, more efficiency - Integrated EVI super compressor, injects additional refrigerant into the compression cycle
  • Exceptionally quiet - With noise levels as low as a modern refrigerator - 42dB(A), flexoTHERM has earned the ‘Quiet Mark’ approval
  • High quality and sustainable - Green iQ technology aids in future-proofing the product and ensures optimum efficiency performance and sustainability
  • Ability to cascade up to seven flexoTHERM heat pumps - Suitable for larger dwellings or developments
  • Ideal for residential projects that may not be suitable for boreholes or ground arrays



Technical dataUnit5kW 400V8kW 400V11kW 400V15kW 400V19kW 400V
Heat source module 1 x VWL 11/4 SA1 x VWL 11/4 SA1 x VWL 11/4 SA2 x VWL 11/4 SA2 x VWL 11/4 SA
Brine fluid type Ethylene glycol 44% volumeEthylene glycol 44% volumeEthylene glycol 44% volumeEthylene glycol 44% volumeEthylene glycol 44% volume
Minimum flow temperature heating°C2525252525
Maximum flow temperature heating with compressor°C6565656565
Nominal flow rate ∆T 8K l/h6601020135017202300
Energy-related Products at 35°C*BandA+++A+++A+++A+++A+++
Energy-related Products at 55°C*BandA+++A+++A+++A+++A+++
Product dimensions (H x D x W)mm1185 x 595 x 6001185 x 595 x 6001185 x 595 x 6001185 x 595 x 6001185 x 595 x 600
Weight, ready for operationkg151167175187200

*Reported efficiency when used with VRC 700 / VRC700f controller